A manager at one of City Island’s best-known seafood joints was slimier than an eel, subjecting a waitress to a barrage of offensive comments, including a come-on to “turn my shrimp into a lobster,” court papers allege.

According to a lawsuit filed today in Bronx Supreme Court, waitress Rosemarie Ferranti, 28, was fired after she complained about the treatment her supervisor, Lanni Liapis, subjected her to at the Lobster Box on City Island Avenue.

“It’s all true. He ruined me,” Ferranti told The Post today.

The restaurant’s owner, Visilios Lambos, said he doubted his manager had harassed Ferranti.

“I don’t think so,” he said. “To be honest, I never saw anything like that.”

Liapis could not immediately be reached for comment.

Ferranti, a divorced mother of two, began waiting tables at the restaurant in February 2009, and Liapis — with whom she’d worked at another restaurant — followed her there a month later. The sexual harassment started up just two months after that, she said.

On one occasion, Liapis was with a friend visiting the restaurant and called Ferranti over, according to the suit.

“He grabbed his penis and said, ‘Come over here. I want you to turn my shrimp into a lobster,” the court papers say.

Ferranti also claims another female employee joined in and Liapis told them to have sex and he would join in.

“Can I have some fun with you?” the woman asked, while grabbing Ferranti’s crotch, the suit alleges.